Chapters 12 and 13 Review Questions

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21. The strength of the gravitational force between two objects depends on the objects'A. masses and the distance between themB. weights and accelerationsC. momentum and velocitiesD. masses and velocities

32. Joseph throws a baseball straight forward2. Joseph throws a baseball straight forward. At the same time, Corey drops a baseball from the same height. Which of the following is TRUE?A. Joseph's baseball falls faster than Corey's.B. Corey's baseball falls faster than Joseph's.C. Both baseballs fall at the same rate.D. You cannot predict which baseball will fall faster.

43. A satellite in orbitA. is not affected by gravityB. is always falling toward EarthC. must have a speed less than 8000 m/sD. cannot fall more than 5 m

54. An astronaut in an orbiting spacecraft floats becauseA. Earth's gravity is too weak to affect the spacecraftB. the spacecraft and the astronaut fall at the same rateC. there is no force of gravity in spaceD. the spacecraft has a low acceleration

76. Which of the following would increase the friction between a table and the floor?A. pushing the table fasterB. pushing the table slowerC. taking heavy objects off the tableD. putting heavy objects on the table

87. As you push an object, the frictional force resisting your pushA. remains constant once the object is movingB. continues to increase even after the object is movingC. steadily decreases after the object begins to moveD. no longer resists once the object begins to move

109. The work a force does on an object depends on theA. height of the object above the groundB. the size of the force and the distance it acts overC. acceleration and the mass of the objectD. the potential energy of the object

1110. A classmate lifts a book 50 cm10. A classmate lifts a book 50 cm. You lift the same book 150 cm using the same force. Compared to your classmate, you have doneA. one third the workB. three times the workC. nine times the workD. the same amount of work

1211. Work can be measured in units calledA. newtonsB. meters per secondC. joulesD. kilograms

1312. Sean pushes a cart 100 m. Which of the following statements is TRUE?A. The cart does work on Sean.B. Sean does no work.C. Sean does work on the cart over the entire 100 m.D. Work is done only when Sean first begins to push.

1413. When Roger kicks a football, the football gains mechanical energy because RogerA. does work on the footballB. does work on the groundC. has more energy than the footballD. has less energy than the football

1514. Yelena holds a 5 kg ball over her head at a height of 2 m14. Yelena holds a 5 kg ball over her head at a height of 2 m. What is the gravitational potential energy (GPE) of the ball? The formula for GPE is GPE = mgh, where g = 9.8 m/s2.A. 5 JB. 9.8 JC. 10 JD. 98 J

1615. Quentin has a mass of 50 kg. When he rides his scooter at a velocity of 3 m/s, what is his kinetic energy? The formula for kinetic energy (KE) is KE = 1/2mv2.A. 50 JB. 75 JC. 225 JD. 450 J

1716. To find the mechanical energy of an object,A. multiply its kinetic energy and potential energyB. add its kinetic energy and potential energyC. divide its kinetic energy by its potential energyD. divide its potential energy by its kinetic energy

1817. Kara does work on a ball by kicking it17. Kara does work on a ball by kicking it. The work Kara does on the ballA. increases Kara's energyB. increases the ball's energyC. decreases the ball's energyD. decreases the ball's mass and height

1918. If you double the distance over which a force moves an object, then the work is multiplied by

2019. If you push a large rock as hard as you possibly can, and the rock does not move,A. you do not use any force or do any work on the rockB. you use force, but do not do any work on the rockC. you do work on the rock, but do not use forceD. you use force and do work on the rock

2120. When you do work on an object, you transferA. powerB. velocityC. energyD. acceleration

2221. Which of the following does work?A. a book lying on a tableB. a person holding a book over her headC. a person reading a page of a bookD. a person pushing a book across a floor

2322. Which of the following will increase the amount of work you do pushing a box?A. increasing the velocity of the boxB. increasing the distance you push the boxC. decreasing the distance you push the boxD. decreasing the force you apply to the box

2423. The force that attracts two masses to each other is calledA. air resistanceB. frictionC. gravityD. pressure

2524. A hollow plastic ball and a solid metal ball are dropped from the same height in a vacuum. With no air resistance, gravity is the only force acting on the balls. What do you predict will happen?A. The balls will fall at the same rate.B. The metal ball will fall faster.C. The plastic ball will fall faster.D. The larger ball will fall faster.

2625. After a space shuttle is launched into orbit, gravityA. gives it a speed greater than 11,000 m/sB. no longer affects the astronauts on boardC. makes it impossible for it to stay in orbit for a long period of timeD. continues to pull it toward the center of Earth

2726. Maria is sliding a box across the floor26. Maria is sliding a box across the floor. She feels the box resisting her push. The resistance is caused byA. pressureB. frictionC. gravityD. motion

2827. The strength of the gravitational force between objects depends onA. mass and distanceB. pressure and areaC. mass and volumeD. force and acceleration

2928. Without air resistance, for example, in a vacuum, the rate of acceleration resulting from Earth's gravityA. depends on the surface area of the falling objectB. is the same for all objects, whatever their massC. depends on the density of the falling objectD. decreases as objects get closer to Earth

3029. An astronaut in orbit experiences microgravity because he or sheA. is too far from Earth to be affected by gravityB. is falling at the same rate as the spacecraftC. is traveling faster than the escape velocityD. is accelerating fast enough to overcome friction

3130. As Eli rubs a piece of wood with sandpaper, the wood becomes warmer. This release of heat is due toA. air pressureB. air resistanceC. frictionD. gravity

3230. As Eli rubs a piece of wood with sandpaper, the wood becomes warmer. This release of heat is due toA. air pressureB. air resistanceC. frictionD. gravity

3331. The formula for calculating the force of gravity on a mass close to Earth's surface is F = mg. The g in this formula isA. the mass of the object in gramsB. the speed of the object as it fallsC. acceleration caused by Earth's gravityD. constant velocity caused by Earth's gravity

3432. Alison dives 5 meters below the surface of a lake32. Alison dives 5 meters below the surface of a lake. The pressure on herA. decreases because under water there is no air pressureB. is directed upward because some objects are buoyant in waterC. is directed downward because air is less dense than waterD. increases because of the weight of all the water above her

3533. Before doing a gymnastics routine on a high bar, Alysha puts rosin, a sticky substance, on her hands. She does this in order toA. increase air pressureB. decrease air resistanceC. decrease gravityD. increase friction